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>Appendix F. Additional Supplied Modules</TD
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><H1
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><A
NAME="ADMINPACK"
>F.1. adminpack</A
></H1
><P
> <TT
CLASS="FILENAME"
>adminpack</TT
> provides a number of support functions which
<SPAN
CLASS="APPLICATION"
>pgAdmin</SPAN
> and other administration and management tools can
use to provide additional functionality, such as remote management
of server log files.
Use of all these functions is restricted to superusers.
</P
><P
> The functions shown in <A
HREF="adminpack.html#FUNCTIONS-ADMINPACK-TABLE"
>Table F-1</A
> provide
write access to files on the machine hosting the server. (See also the
functions in <A
HREF="functions-admin.html#FUNCTIONS-ADMIN-GENFILE-TABLE"
>Table 9-66</A
>, which
provide read-only access.)
Only files within the database cluster directory can be accessed, but
either a relative or absolute path is allowable.
</P
><DIV
CLASS="TABLE"
><A
NAME="FUNCTIONS-ADMINPACK-TABLE"
></A
><P
><B
>Table F-1. <TT
CLASS="FILENAME"
>adminpack</TT
> Functions</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Return Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_file_write(filename text, data text, append boolean)</CODE
></TD
><TD
><TT
CLASS="TYPE"
>bigint</TT
></TD
><TD
> Write, or append to, a text file
</TD
></TR
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_file_rename(oldname text, newname text [<SPAN
CLASS="OPTIONAL"
>, archivename text</SPAN
>])</CODE
></TD
><TD
><TT
CLASS="TYPE"
>boolean</TT
></TD
><TD
> Rename a file
</TD
></TR
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_file_unlink(filename text)</CODE
></TD
><TD
><TT
CLASS="TYPE"
>boolean</TT
></TD
><TD
> Remove a file
</TD
></TR
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_logdir_ls()</CODE
></TD
><TD
><TT
CLASS="TYPE"
>setof record</TT
></TD
><TD
> List the log files in the <TT
CLASS="VARNAME"
>log_directory</TT
> directory
</TD
></TR
></TBODY
></TABLE
></DIV
><P
> <CODE
CLASS="FUNCTION"
>pg_file_write</CODE
> writes the specified <TT
CLASS="PARAMETER"
>data</TT
> into
the file named by <TT
CLASS="PARAMETER"
>filename</TT
>. If <TT
CLASS="PARAMETER"
>append</TT
> is
false, the file must not already exist. If <TT
CLASS="PARAMETER"
>append</TT
> is true,
the file can already exist, and will be appended to if so.
Returns the number of bytes written.
</P
><P
> <CODE
CLASS="FUNCTION"
>pg_file_rename</CODE
> renames a file. If <TT
CLASS="PARAMETER"
>archivename</TT
>
is omitted or NULL, it simply renames <TT
CLASS="PARAMETER"
>oldname</TT
>
to <TT
CLASS="PARAMETER"
>newname</TT
> (which must not already exist).
If <TT
CLASS="PARAMETER"
>archivename</TT
> is provided, it first
renames <TT
CLASS="PARAMETER"
>newname</TT
> to <TT
CLASS="PARAMETER"
>archivename</TT
> (which must
not already exist), and then renames <TT
CLASS="PARAMETER"
>oldname</TT
>
to <TT
CLASS="PARAMETER"
>newname</TT
>. In event of failure of the second rename step,
it will try to rename <TT
CLASS="PARAMETER"
>archivename</TT
> back
to <TT
CLASS="PARAMETER"
>newname</TT
> before reporting the error.
Returns true on success, false if the source file(s) are not present or
not writable; other cases throw errors.
</P
><P
> <CODE
CLASS="FUNCTION"
>pg_file_unlink</CODE
> removes the specified file.
Returns true on success, false if the specified file is not present
or the <CODE
CLASS="FUNCTION"
>unlink()</CODE
> call fails; other cases throw errors.
</P
><P
> <CODE
CLASS="FUNCTION"
>pg_logdir_ls</CODE
> returns the start timestamps and path
names of all the log files in the <A
HREF="runtime-config-logging.html#GUC-LOG-DIRECTORY"
>log_directory</A
>
directory. The <A
HREF="runtime-config-logging.html#GUC-LOG-FILENAME"
>log_filename</A
> parameter must have its
default setting (<TT
CLASS="LITERAL"
>postgresql-%Y-%m-%d_%H%M%S.log</TT
>) to use this
function.
</P
><P
> The functions shown
in <A
HREF="adminpack.html#FUNCTIONS-ADMINPACK-DEPRECATED-TABLE"
>Table F-2</A
> are deprecated
and should not be used in new applications; instead use those shown
in <A
HREF="functions-admin.html#FUNCTIONS-ADMIN-SIGNAL-TABLE"
>Table 9-59</A
>
and <A
HREF="functions-admin.html#FUNCTIONS-ADMIN-GENFILE-TABLE"
>Table 9-66</A
>. These functions are
provided in <TT
CLASS="FILENAME"
>adminpack</TT
> only for compatibility with old
versions of <SPAN
CLASS="APPLICATION"
>pgAdmin</SPAN
>.
</P
><DIV
CLASS="TABLE"
><A
NAME="FUNCTIONS-ADMINPACK-DEPRECATED-TABLE"
></A
><P
><B
>Table F-2. Deprecated <TT
CLASS="FILENAME"
>adminpack</TT
> Functions</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Return Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_file_read(filename text, offset bigint, nbytes bigint)</CODE
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
> Alternate name for <CODE
CLASS="FUNCTION"
>pg_read_file()</CODE
>
</TD
></TR
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_file_length(filename text)</CODE
></TD
><TD
><TT
CLASS="TYPE"
>bigint</TT
></TD
><TD
> Same as <TT
CLASS="STRUCTFIELD"
>size</TT
> column returned
by <CODE
CLASS="FUNCTION"
>pg_stat_file()</CODE
>
</TD
></TR
><TR
><TD
><CODE
CLASS="FUNCTION"
>pg_catalog.pg_logfile_rotate()</CODE
></TD
><TD
><TT
CLASS="TYPE"
>integer</TT
></TD
><TD
> Alternate name for <CODE
CLASS="FUNCTION"
>pg_rotate_logfile()</CODE
>, but note that it
returns integer 0 or 1 rather than boolean
</TD
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